Sentry is a card that has aged relatively well over the years. He generally becomes better as player count increases due to the fact that an extra encounter card is less likely to end the game with every player added. In multiplayer if your teammates have built around defeating side schemes/minions (Skilled Investigator, Overwatch, Even the Odds, Cable, Excess Damage/Minion Slaying Builds, etc) the extra encounter card can even work towards enabling their builds/combos. Not ideal for single player and requires some deck building and piloting considerations (allow some time for teammates to build out before playing in tougher scenarios).

With the Agents of SHIELD wave and the upcoming Civil War expansion, I've been revisiting Avengers cards, especially those I haven't played in years. This one I don't think I've ever played until this refresh and it's been amazing. Didn't really appreciate how good healing even a single hit point from an ally can be. Inspiring Presence also readies the ally, but this card can heal the hero, too. Almost never a dead card.

Place him in your Med Lab and replay him whenever you or your team is gonna burst kill something (like a villain's entire stage) Bonus points with Ironheart or War Machine

200 characters long' check (..............................................................................................................................................................)

Probably Quicksilver and X-23, who are the king and queen in amounts of readies per turn, could get use of it.

Basically, per 2 Effective Resources you need to get two extra readies to achieve an average effect (+3-ATK/THW). It will start to shine if you can ready more than two times per turn. Hard to achieve but definitively not impossible with the said heroes

This card works with requirements of having/exhausting SHIELD cards. Is cheap. Maria Hill (Hero) can include in her deck without bloating it as its gonna be only one copy. Does stack with other cards like Utopia and having allies now can passively give benefits (like by just having the SHIELD trait, example Organizational Support), or for a big boom like Avengers Assemble!, Blaze of Glory, Lead from the Front, or by having a swarm of AERIAL dudes that can be exhausted to pay cards or help other birds in your sky.